No you do not.
My experience was that Juice/Attitude and Smarty were not a really good mix. If you are going to use the Juice power levels I would load Smarty even numbers and go easy on the Juice until you see how the timing is and performance is.
You can always just leave the Juice on stock settings for the monitoring and guage functions. Then load the Smarty odd (with timing) number levels.
Just my experience and . 02.